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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03919f05b58fb87efe0835d36a7bb5c6f7a366f0170a1aa9a240cba798848ba2' 
  AND token = 'LrwSLU51pofWUzFhvHFr6gmRDUepONG3IDJ5sKUMQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}